Web site YouSwear teaches you to swear in over 200 languages, from Afrikaans to Yiddish to Firefly.

Bill Gates predicts that the best education will come from the web in five years, but YouSwear demonstrates how nearly everything worth learning is already available on the internet anyway. Click on any language in the site's sidebar to browse through user-submitted swears (the accuracy of which is also user-vetted through familiar thumbs up/down buttons), search for a specific swear (which will get you to a page titled, for example, "How to say sh*t in any language"), or choose from the quick list of common curses. There's not much more to it than that.

Apart from regular old human languages, the site also breaks down swearing across the galaxy, including Klingon, Battlestar Galactica (okay, it's really just "frak"), and whatever they speak in Firefly (which I believe is actually Mandarin—Annalee from io9 tells me "it's real Mandarin but of course their accents are terrible").